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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5ce8b7de8cadfe3e8109daa7f0aa49a225a7a63527d3fc1447ba8b5bf5b9663' 
  AND token = 'hq1DdQbVdlXhbm6E4Zgnr8miBSGiD6LjVqXDR7utyi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}